HashMap: Updation and Removal

Fetching an element from a HashMap

There are two ways to get an element from a HashMap.

Using the get() method

The get(Object key) method takes a key as a parameter and returns the value corresponding to that key. If the key is not present, it returns null.

Using the getOrDefault() method

The getOrDefault(Object key, V defaultValue) method is useful if are not sure whether a key is present in the Map or not. If the key is present then this method returns the value corresponding to the key and ...